biography
| name: |
Zhang Heng
|
| |
also spelled Chang Heng
|
pronunciation:
[jang heng]
| sex:
| male
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| lived:
| (78–139)
|
| biography:
| Chinese scientist who invented the seismograph (132). He also calculated the value of π, built an armillary sphere with horizon and meridian rings, and realized natural phenomena were not caused by the supernatural. He understood the Earth was spherical, and that the Moon was lit by the Sun, revolved around the Earth, and was eclipsed by Earth's shadow. He explained the shortening/lengthening of days, and invented the grid system in cartography. |
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